There's an Ebay auction for Stand Up to Cancer revolving around Iron Man 2. The auction ends on Sept. 15th, and the winner will enjoy:

* A visit to the set of Iron Man 2 (one shooting day) o Location of visit will be determined by Marvel based on scheduling of visit * A meet and greet with the cast * A walk-on/ extra role in the film for the auction winner o Role and length of screen time to be determined by Marvel * Photo tour of the set with an Iron Man unit photographer to document the tour. Professional photos will be given to the winner of the experience. * Tickets to the Los Angeles premiere for you and a guest * Winner and Guest will walk the premiere’s red carpet